this should be good soon to follow loud metallic sound under hood what could it be one of the reasons i bought this car is because anything and everything under the sun that you can imagine could have been done to it has been done to it every jdm engine ever swapped over twodozen shippedtoyourdoor full exhaust options every tranny you could want do your research nasoic iwsti igotasti fastwrx clubwrx all places with a plethora of information nobody can tell you anything specific if you dont give us anything to work with there is more than one type of sti